CN103807329A - Eddy current retarder device based on magnetorheological effect - Google Patents
Eddy current retarder device based on magnetorheological effect Download PDFInfo
- Publication number
- CN103807329A CN103807329A CN201410068391.0A CN201410068391A CN103807329A CN 103807329 A CN103807329 A CN 103807329A CN 201410068391 A CN201410068391 A CN 201410068391A CN 103807329 A CN103807329 A CN 103807329A
- Authority
- CN
- China
- Prior art keywords
- magnetic
- stator
- stator case
- pole shoe
- interior side
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
- Braking Arrangements (AREA)
Abstract
The invention relates to an eddy current retarder device based on the magnetorheological effect. The eddy current retarder device comprises rotor discs, a stator assembly, a transmission shaft and magnetorheological fluid. The stator assembly comprises a bearing sleeve, stator shells and the like and is located in the middle, the two rotor discs are placed in the stator shells on the two sides of the stator assembly respectively, and gaps between the shells and the rotor discs are filled with the magnetorheological fluid. Eight excitation devices are respectively fixed to the inner side shell of the stator shells on the two sides. Through the structure, air gaps between rotors and a stator are replaced by the magnetorheological fluid with high magnetic permeability and low electrical conductivity, and therefore magnetic circuit magnetic resistance is reduced; meanwhile, under the magnetic field effect, the magnetorheological fluid is converted from Newtonian fluid with low viscosity into Bingham fluid with high shear yield stress. In the brake process, the brake torque generated by eddy currents and the brake torque generated by the magnetorheological fluid act at the same time. The eddy current retarder device with the structure has the advantages of being capable of saving energy and electricity, small in coil heating amount, large in brake torque, and good in brake torque controllability and low-speed performance.
Description
Technical field
The present invention relates to a kind of electric eddy current retarder based on magnetic rheology effect, particularly with the electric eddy current retarder of magnetic flow liquid while as magnetic conductive media and working medium.
Background technique
Along with the development of automotive industry, the travelling speed of automobile is more and more faster, and Braking efficiency and the Security of automobile are also paid close attention to widely.Traditional break, the in the situation that of long-time lasting braking, can produce heat fade phenomenon, causes Braking efficiency greatly to reduce, and has a strong impact on the Safety performance of automobile.Along with in recent years, country, about the proposition of automotive safety rules, must be provided with auxiliary brake on large truck, passenger vehicle.Automobile auxiliary brake can be born most braking energy, reduces the brake load of Service Brake, the Security that greatly improves automobile.The complemental brake system of main application is electric eddy current retarder and hydrodynamic retarder at present.
There is following shortcoming in existing electric eddy current retarder:
1, there is certain air gap in the pole shoe of electric eddy current retarder and rotor, because the magnetic conductivity of air is extremely low, cause magnetic circuit reluctance very large, therefore want in rotor to produce enough large eddy current effect, field coil must pass through very large exciting current, cause field coil excess Temperature, and storage battery load is large, affects the life-span of battery.
2, the braking moment of electric eddy current retarder not only and pass into the current related of field coil, and also has much relations with car speed.Car speed is higher, and braking moment is larger; Speed is lower, and braking moment is less.So in automobile low speed situation, the braking moment of electric eddy current retarder is little, slow effect is undesirable.
Current hydrodynamic retarder has following shortcoming:
1, the complex structure of hydrodynamic retarder, accuracy of manufacturing is high, and cost is high.
2, hydrodynamic retarder braking moment in the time of low speed is very little, can not meet brake request; And when braking, working solution is pressed into active chamber needs certain hour, causes the braking response time long.
Magnetic flow liquid is a kind of novel intelligent material, and it is to disperse to be dissolved in by the soft magnetism microparticle of high permeability, low magnetic hysteresis the suspension forming in insulating base liquid.Under magnetic fields, the apparent viscosity of magnetic flow liquid increases rapidly in several milliseconds, and shear yield stress increases with the increase in magnetic field, in the time removing magnetic field, reverts to rapidly again original low viscous state.This liquid is not only along with externally-applied magnetic field changes and can control the stable suspension of its rheological properties, and has higher magnetic conductivity, very low electric conductivity and fabulous thermostability.So in recent years, be widely used in the research of New Brake, and there is good application prospect.
At present, magneto-rheologic liquid brake is mostly disk type braker (for example, referring to Chinese patent 201110427735.9, U.S. Pat 8631917B2), utilize magnetic flow liquid to be filled between rotor and stator as break working solution, by uniform magnetic field, the shear yield stress of magnetic flow liquid is increased, reach the effect of braking.But only utilize the rheological properties of magnetic flow liquid under outside magnetic fields to produce the feature that braking moment is braked, so the braking moment providing is very limited.Chinese patent 201210434149.1, name is called " based on free-standing hydrodynamic retarder and the controlling method thereof of magnetic flow liquid ", utilize the working solution of magnetic flow liquid as hydrodynamic retarder, and increase braking moment and the low-speed performance that improves retarder by the rheological properties of magnetic flow liquid, but its complex structure, design makes magnetic flow liquid viscosity change uniform excitation device difficulty, and the inhomogeneous magnetic flow liquid of viscosity is difficult to guarantee the stability of braking effect in the complexity of chamber, whirlpool flow field.
Summary of the invention
In view of the deficiencies in the prior art, the object of the present invention is to provide the coefficient Novel retarding apparatus of a kind of magnetic rheology effect and eddy current effect, it has between stator and rotor without air gap, exciting current little, the feature that coil heating is low, braking moment is large, low speed braking ability is good, braking moment controllability is good, simple in structure.
Technical program of the present invention lies in:
A kind of electric vortex buffering apparatus based on magnetic rheology effect, it is characterized in that: comprise that a bearing sleeve and is located at the transmission shaft in bearing sleeve, the two ends of described bearing sleeve are respectively equipped with a stator case, in described stator case, be installed on the rotor disk being connected with transmission shaft, between described rotor disk and stator case, fill magnetic flow liquid, bearing sleeve periphery between two stator cases is provided with magnetic core, on described magnetic core, have around the home field coil, the two ends of described magnetic core are connected through pole shoe and stator case inwall.
Wherein, described stator case comprises outside housing, interior side body and circular cylindrical shell.
Described pole shoe, magnetic core, field coil composition excitation device, and described excitation device is 8, the center of circle of 8 excitation devices lays respectively between the stator case of both sides, the a pair of pole shoe of each excitation device is uniformly distributed on the same standard pitch circle of the interior side body that is fixed on both sides stator case, and the magnetic pole of two adjacent excitation devices is always contrary.
Described a pair of pole shoe be shaped as two vary in size outstanding fan-shaped, on described interior side body, offer the fan-shaped groove matching with pole shoe, described pole shoe inserts in the fan-shaped groove of interior side body, form the disk body of sealing with interior side body, and pole shoe and filling in stator case magnetic flow liquid directly contact.
On described interior side body, have exhaust port, on the housing of outside, have liquid filling hole, liquid filling hole, exhaust port are blocked by fluting tack Cock screw; There are respectively two tapped holes the both sides of described circular cylindrical shell, for being connected with outer stator.
The invention has the advantages that:
1, utilize permeability higher, the magnetic flow liquid that specific conductance is extremely low replaces non-magnetic air gap in traditional electrical eddy current retarder, greatly reduces the magnetic resistance in magnetic circuit.So, under identical exciting current, can significantly increase the magnetic flux by rotor disk, thereby the braking moment of retarder is obviously increased.Obtaining under the prerequisite of identical slow effect, the exciting current that field coil needs obviously reduces, thereby greatly reduces the heating of field coil and the load of storage battery.
2, in this device, the braking moment that magnetic rheology effect produces is only relevant with the size of external magnetic field strength, irrelevant with the rotating speed of rotor disk.So, when braking, the braking moment that the braking moment that magnetic rheology effect produces and eddy current effect produce acts on simultaneously, and this not only makes the maximum braking moment of electric eddy current retarder increase, and has improved low speed braking ability and the braking moment controllability of electric eddy current retarder.
3, the shear yield stress of magnetic flow liquid can increase rapidly in several milliseconds, not only can not reduce the braking response time of electric eddy current retarder, and control the shear yield stress of magnetic flow liquid simultaneously and by the magnetic flux of rotor disk, make the Current Control of this device simple and reliable by the electric current of field coil.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention.
Fig. 2 is outside housing right elevation.
Fig. 3 is interior side body left view.
Fig. 4 is circular cylindrical shell left view.
Fig. 5 is pole shoe left view.
Fig. 6 is under working state, magnetic circuit schematic diagram.
Wherein: 1. circular cylindrical shell; 2. outside housing; 3. rotor disk; 4. magnetic flow liquid; 5. interior side body; 6. parallel key; 7. outer lip-type packing; 8. bearing cap; 9. pole shoe; 10. fan-shaped seal ring; 11. inner bearings; 12. interior lip-type packings; 13. outer bearings; 14. transmission shafts; 15. check rings; 16. sleeves; 17. bearing sleeves; 18. sunk screws; 19. fluting flush end Cock screws; 20. magnetic cores; 21. field coils; 22. seal washers.
Embodiment
For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate accompanying drawing, be described in detail below.
As shown in Figure 1, the present invention is mid-stator assembly, the two-spool symmetrical structure in both sides, comprises circular cylindrical shell 1(2), outside housing 2(2), rotor disk 3(2), magnetic flow liquid 4, interior side body 5(2), parallel key 6(2), outer lip-type packing 7(2), bearing cap 8(2), pole shoe 9(16), fan-shaped seal ring 10(4), inner bearing 11(2), interior lip-type packing 12(2); Outer bearing 13(2), transmission shaft 14, check ring 15(4), sleeve 16(2), bearing sleeve 17, sunk screw 18(16), 19(4 of fluting flush end Cock screw), magnetic core 20(8), field coil 21(8), seal washer 22(4).Wherein, circular cylindrical shell 1, outside housing 2, interior side body 5, bearing sleeve 17 form stator assembly.Circular cylindrical shell 1, outside housing 2, interior side body 5 are assembled into stator case.The stator case of the both sides that rotor disk 3 is placed in respectively.Bearing sleeve 17 is between two stator cases, and both sides are separately fixed on two stator cases.Pole shoe 9, magnetic core 20, field coil 21 form excitation device, the center of circle of 8 excitation devices lays respectively between the stator case of both sides, be uniformly distributed by two pole shoes 9 on the same standard pitch circle of the interior side body 5 that is fixed on both sides stator case, and the magnetic pole of two adjacent excitation devices is always contrary.
As shown in Figure 2 and Figure 3, on interior side body 5, have exhaust port 24, have liquid filling hole 23 on outside housing 2, liquid filling hole 23, exhaust port 24 are blocked by fluting tack Cock screw 19.After retarder installs, can take out fluting tack Cock screw 19, magnetic flow liquid 4 is filled in uniformly in the gap of rotor disk 3 and stator case, replace the air gap between rotor disk 3 and stator case.
Form an excitation device by two pole shoes 9, magnetic core 20, a field coil 21, two pole shoes 9 are symmetrically distributed in the both sides of magnetic core 20, and connect by fluting flush end Cock screw 18.
As shown in Fig. 3, Fig. 5, pole shoe 9 is shaped as two vary in size protruding fan-shaped, matches with the groove 25 on the interior side body 5 of stator case, and pole shoe 9 is directly inserted in interior side body 5, and pole shoe 9 is directly contacted with magnetic flow liquid 4.And be screwed, fan-shaped seal ring 10 seals, and the magnetic flow liquid 4 preventing is revealed.
Circular cylindrical shell 1, outside housing 2, interior side body 5 are connected by screw and are assembled into stator case, wherein circular cylindrical shell 1, outside housing 2, interior side body 5 are all that NULL (as low carbon steel, aluminium) is made, between interior side body 5 and circular cylindrical shell 1, between outside housing 2 and circular cylindrical shell 1, all seal with seal washer 22, in order to avoid magnetic flow liquid 4 is revealed.
The interior side body 5 of both sides stator case is connected by screw with the both sides of bearing sleeve 17, and a pair of symmetrical inner bearing 11 and sleeve 16 are housed in bearing sleeve 117, and sleeve 16 is for fixing inner bearing 11.The convex shoulder of bearing sleeve 17 inside is for the mounting point of definite inner bearing 11, and sleeve 16 is for the position of fixing inner bearing 11.
The bearing cap 8 of both sides is connected with outside housing by screw, the interior outer bearing 13 that is equipped with respectively of bearing cap 8.
Between rotor disk 3 and transmission shaft 14, be parallel key 6 and be connected, two check rings 15 are equipped with respectively in the both sides of rotor disk 3, for the axial position of fixed rotor dish 3.
Outer lip-type packing 7 and interior lip-type packing 12, for the axial seal of stator case, prevent the axial both sides leakage of magnetic flow liquid 4 from stator case.Outer lip-type packing 7 is arranged in the groove of outside housing 2, and the other end is fixed by bearing cap 8, and interior lip-type packing 12 is arranged in the groove of interior side body 5, and the other end is fixed by the shaft shoulder of transmission shaft 14.
As shown in Figure 4, there are respectively two tapped holes 26 both sides of circular cylindrical shell 1, for being connected with outer stator.
As shown in Figure 6, under non-braking state, field coil 21 no electric circuits, in device, exist without magnetic field, now, magnetic flow liquid 4 is Newtonian fluids that viscosity pole is low, the drag minimization that rotor disk 3 rotates, Braking Action None, so rotor disk 3 rotates freely in stator case.Under braking state, field coil 21 is switched on, in device, produce closed-loop path, magnetic field, because stator case is that NULL is made, magnetic circuit is without stator case, so its magnetic conductive loop is: pole shoe 9-3, the magnetic flow liquid 4-2 of magnetic core 20-1, pole shoe 9-1, magnetic flow liquid 4-1, rotor disk 3-1, magnetic flow liquid 4-1, the pole shoe 9-2 of adjacent excitation device, the magnetic core 20-2 of adjacent excitation device, adjacent excitation device, rotor disk 3-2, magnetic flow liquid 4-2, pole shoe 9-4, magnetic core 20-1.Because rotor disk 3 rotates in magnetic field, cutting magnetic field, produces electric convolution on rotor disk 3.Electric convolution, under the effect in magnetic field, makes rotor disk 3 produce braking moment.Because the conductivity of magnetic flow liquid 4 is extremely low, be equivalent to insulator, so magnetic flow liquid inside does not produce electric convolution.Meanwhile, the magnetic flow liquid 4 directly contacting with pole shoe 9, under magnetic fields, is changed into the Bingham fluid with higher shear yield stress by the low Newtonian fluid of viscosity pole, rotor disk 3 is produced to braking moment.Two braking moments act on simultaneously, produce the effect of slow braking.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (5)
1. the electric vortex buffering apparatus based on magnetic rheology effect, it is characterized in that: comprise that a bearing sleeve and is located at the transmission shaft in bearing sleeve, the two ends of described bearing sleeve are respectively equipped with a stator case, in described stator case, be installed on the rotor disk being connected with transmission shaft, between described rotor disk and stator case, fill magnetic flow liquid, bearing sleeve periphery between two stator cases is provided with magnetic core, on described magnetic core, have around the home field coil, the two ends of described magnetic core are connected through pole shoe and stator case inwall.
2. a kind of electric vortex buffering apparatus based on magnetic rheology effect according to claim 1, is characterized in that: described stator case comprises outside housing, interior side body and circular cylindrical shell.
3. a kind of electric vortex buffering apparatus based on magnetic rheology effect according to claim 2, it is characterized in that: described pole shoe, magnetic core, field coil composition excitation device, and described excitation device is 8, the center of circle of 8 excitation devices lays respectively between the stator case of both sides, the a pair of pole shoe of each excitation device is uniformly distributed on the same standard pitch circle of the interior side body that is fixed on both sides stator case, and the magnetic pole of two adjacent excitation devices is always contrary.
4. a kind of electric vortex buffering apparatus based on magnetic rheology effect according to claim 3, it is characterized in that: described a pair of pole shoe be shaped as two vary in size outstanding fan-shaped, on described interior side body, offer the fan-shaped groove matching with pole shoe, described pole shoe inserts in the fan-shaped groove of interior side body, form the disk body of sealing with interior side body, and pole shoe and filling in stator case magnetic flow liquid directly contact.
5. a kind of electric vortex buffering apparatus based on magnetic rheology effect according to claim 2, is characterized in that: on described interior side body, have exhaust port, on the housing of outside, have liquid filling hole, liquid filling hole, exhaust port are blocked by fluting tack Cock screw; There are respectively two tapped holes the both sides of described circular cylindrical shell, for being connected with outer stator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410068391.0A CN103807329B (en) | 2014-02-27 | 2014-02-27 | A kind of electric vortex buffering apparatus based on magnetic rheology effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410068391.0A CN103807329B (en) | 2014-02-27 | 2014-02-27 | A kind of electric vortex buffering apparatus based on magnetic rheology effect |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103807329A true CN103807329A (en) | 2014-05-21 |
| CN103807329B CN103807329B (en) | 2016-05-04 |
Family
ID=50704557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410068391.0A Expired - Fee Related CN103807329B (en) | 2014-02-27 | 2014-02-27 | A kind of electric vortex buffering apparatus based on magnetic rheology effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103807329B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104565120A (en) * | 2014-12-08 | 2015-04-29 | 中国矿业大学 | Magnetic flow variable-liquid and variable-torque device |
| CN111175108A (en) * | 2020-03-01 | 2020-05-19 | 东北石油大学 | Ultra-low permeability natural core pillar electrode and pressure measuring point arrangement pouring method |
| CN111907336A (en) * | 2019-05-09 | 2020-11-10 | 株洲中车时代电气股份有限公司 | Eddy current brake, control device of eddy current brake and magnetic suspension train |
| CN112128276A (en) * | 2020-09-09 | 2020-12-25 | 常州机电职业技术学院 | Electromagnetic hydraulic composite braking retarding device and braking method thereof |
| CN112319233A (en) * | 2020-10-13 | 2021-02-05 | 江苏大学 | Eddy current-magnetorheological fluid composite brake and brake control method thereof |
| CN113629966A (en) * | 2021-08-11 | 2021-11-09 | 东南大学 | Axial flux permanent magnet motor integrated with magnetorheological fluid braking structure |
| CN114938664A (en) * | 2019-12-18 | 2022-08-23 | 因文图斯工程有限公司 | Magneto-rheological brake device |
| US11599136B1 (en) * | 2022-01-11 | 2023-03-07 | Dell Products L.P. | Magnetorheological fluid (MRF) rotary damper for adaptive user input device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5842547A (en) * | 1996-07-02 | 1998-12-01 | Lord Corporation | Controllable brake |
| CN2851003Y (en) * | 2005-11-30 | 2006-12-27 | 深圳市特尔佳运输科技有限公司 | Central electric eddy speed damper |
| CN202071705U (en) * | 2011-05-26 | 2011-12-14 | 华中科技大学 | Eddy current retarder with big braking torque |
| CN103057427A (en) * | 2013-01-08 | 2013-04-24 | 清华大学 | Magneto-rheological hydraulic brake executing device for electric vehicles |
| CN203702930U (en) * | 2014-02-27 | 2014-07-09 | 福州大学 | Efficient eddy current retarder |
-
2014
- 2014-02-27 CN CN201410068391.0A patent/CN103807329B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5842547A (en) * | 1996-07-02 | 1998-12-01 | Lord Corporation | Controllable brake |
| CN2851003Y (en) * | 2005-11-30 | 2006-12-27 | 深圳市特尔佳运输科技有限公司 | Central electric eddy speed damper |
| CN202071705U (en) * | 2011-05-26 | 2011-12-14 | 华中科技大学 | Eddy current retarder with big braking torque |
| CN103057427A (en) * | 2013-01-08 | 2013-04-24 | 清华大学 | Magneto-rheological hydraulic brake executing device for electric vehicles |
| CN203702930U (en) * | 2014-02-27 | 2014-07-09 | 福州大学 | Efficient eddy current retarder |
Non-Patent Citations (3)
| Title |
|---|
| 侯俊 等: "电流变液力缓速器的探索与研究", 《湖北汽车工业学院学报》 * |
| 王意东 等: "汽车电涡流缓速器综述", 《长江大学学报》 * |
| 郑祥盘: "磁流变液技术及其工程应用研究综述", 《工程机械》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104565120A (en) * | 2014-12-08 | 2015-04-29 | 中国矿业大学 | Magnetic flow variable-liquid and variable-torque device |
| CN111907336A (en) * | 2019-05-09 | 2020-11-10 | 株洲中车时代电气股份有限公司 | Eddy current brake, control device of eddy current brake and magnetic suspension train |
| CN114938664A (en) * | 2019-12-18 | 2022-08-23 | 因文图斯工程有限公司 | Magneto-rheological brake device |
| CN114938664B (en) * | 2019-12-18 | 2024-04-05 | 因文图斯工程有限公司 | Magnetorheological braking device |
| CN111175108A (en) * | 2020-03-01 | 2020-05-19 | 东北石油大学 | Ultra-low permeability natural core pillar electrode and pressure measuring point arrangement pouring method |
| CN112128276A (en) * | 2020-09-09 | 2020-12-25 | 常州机电职业技术学院 | Electromagnetic hydraulic composite braking retarding device and braking method thereof |
| CN112128276B (en) * | 2020-09-09 | 2022-06-14 | 常州机电职业技术学院 | Electromagnetic hydraulic composite braking retarding device and braking method thereof |
| CN112319233A (en) * | 2020-10-13 | 2021-02-05 | 江苏大学 | Eddy current-magnetorheological fluid composite brake and brake control method thereof |
| CN112319233B (en) * | 2020-10-13 | 2022-03-22 | 江苏大学 | Eddy current-magnetorheological fluid composite brake and brake control method thereof |
| CN113629966A (en) * | 2021-08-11 | 2021-11-09 | 东南大学 | Axial flux permanent magnet motor integrated with magnetorheological fluid braking structure |
| US11599136B1 (en) * | 2022-01-11 | 2023-03-07 | Dell Products L.P. | Magnetorheological fluid (MRF) rotary damper for adaptive user input device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103807329B (en) | 2016-05-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103807329B (en) | A kind of electric vortex buffering apparatus based on magnetic rheology effect | |
| CN203702930U (en) | Efficient eddy current retarder | |
| CN104534100B (en) | Improve high linear speed and the new method in stationary magnetic hydraulic seal life-span | |
| CN204828678U (en) | Magnetic fluid sealing device of multilayer heat dissipation web cooling slot type | |
| CN103133700B (en) | A kind of magnetic liquid rotating sealing device | |
| CN103939618B (en) | The magnetic fluid seal device of porous pole shoe | |
| CN106838062B (en) | A kind of Y type brake disc magnetic rheological brake | |
| CN107956883A (en) | A kind of radial direction socket type labyrinth type device for sealing magnetic fluid | |
| CN103812247B (en) | There is the high speed permanent magnet motor rotor of duplex sheath structure | |
| CN104728264A (en) | Lorentz-force axial magnetic bearing of outer rotor | |
| CN207634700U (en) | A kind of radial direction socket type labyrinth type device for sealing magnetic fluid | |
| CN107061558B (en) | A kind of more magneto-rheologic liquid brakes of wall-cooled type | |
| CN109595344A (en) | Magnetic fluid seal device with heat conductive rod and radiating sleeve | |
| CN202884037U (en) | Magnetofluid sealing device for vacuum coated transmission mechanism | |
| CN103343822A (en) | Magnetic liquid rotating sealing device suitable for space station | |
| CN205401723U (en) | Cascaded magnetic fluid seal device of symmetry type | |
| CN107917192A (en) | A kind of multilevel sleeve type device for sealing magnetic fluid | |
| CN110635586A (en) | Motor with low magnetic resistance | |
| CN102588606A (en) | Magnetic fluid sealing device for vacuum coating drive mechanism | |
| CN205824190U (en) | A kind of notch cuttype end-surface type magnetic fluid seal device | |
| CN103326536B (en) | A kind of employing coil and permanent magnet hybrid excitation type eddy current retarder | |
| CN107893856A (en) | A kind of telescopic device for sealing magnetic fluid of mixed type | |
| CN207554797U (en) | A kind of telescopic device for sealing magnetic fluid of mixed type | |
| CN208793628U (en) | A kind of magnetic source alternating expression socket type device for sealing magnetic fluid | |
| CN207584030U (en) | A kind of multilevel sleeve type device for sealing magnetic fluid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160504 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |